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通貨膨脹迫使家庭縮減支出。米娜說，她家已不再購買品牌商品，自2017年以來也未曾出國旅行。
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How this addresses the real-world failures from earlier
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.